Technology is broadly defined as the tools and machines that humans use to solve real-world problems. These can include both tangible objects like utensils and vehicles, as well as intangible ones such as computer software. It has been described as a powerful force in culture, as it shapes and reflects the values of a given system. For example, the development of language enabled more complex communication; the discovery of fire allowed people to cook and preserve food; changes in sanitation and preventive medicine have increased life expectancy; bows and arrows gave way to gunpowder and nuclear weapons; the printing press enabled mass-production of books; and the Internet has allowed individuals to communicate with each other worldwide.
While many technologies have had positive impacts, they can also have negative effects. They can disrupt existing social hierarchies, cause environmental damage, and harm particular individuals or groups. Some of the more notable negative impacts have been the creation of diseases through contaminated water and food; the destruction of nature through overpopulation and commercialization; and the rise in socioeconomic inequality.
The most popular technological development of modern times is the Internet, which allows individuals to stay in contact with each other via written messages and audio and visual content. Many companies also rely on Internet-related technology to communicate with their employees, customers and the outside world. Education is another field that relies heavily on the use of technology. Online courses, virtual classrooms, and eLearning platforms allow teachers to upload lessons and assessments to be accessed by students from anywhere.